It's hard to tell from a distance.
If the car pulls to the right, the braking force seems stronger on the right side.
This can be caused by pressure differences. This can, in turn, be caused by air bubbles remaining in the system, although you'd usually notice this if the brake pedal felt too soft.
It could certainly also be caused by a defective master cylinder, although this wouldn't spontaneously break with such a conversion.
Or by different friction values of the brake pad/rotor combination. Are your brake pads and rotors new?
I recently had a Mercedes B-Class belonging to a friend that I repaired and wanted to take through the TÜV which is the German technical inspection for safety. The TÜV criticized unequal braking values on the right and left. The discs and pads looked as good as new, so I focused on the rest of the braking system.
In the end, it was the brake pads and rotors that somehow had different values. After I replaced them, everything was fine.
Just swap the discs and pads from left to right. Then you'll notice if the car suddenly pulls to the left.
Funny story, when I went to the TÜV inspection for the third time - I obviously don't have a brake tester in the workshop - the TÜV inspector was too tough on the brake tester and ripped off my front bumper... I think I was the first customer to get an TÜV inspection with a ripped off front bumper.